package com.web25;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;



/**
 * Servlet Filter implementation class ImageFilter
 */
public class ImageFilter implements Filter {

    /**
     * Default constructor. 
     */
    public ImageFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		// pass the request along the filter chain
		
          HttpServletRequest req= (HttpServletRequest) request;
          HttpServletResponse res= (HttpServletResponse) response;
          String referer= req.getHeader("Referer");
          System.out.println("referer="+referer);
          System.out.println("Server="+req.getServerName() );
          if ( null == referer ||  !referer.contains( "localhost" )  ) {
                  req.getRequestDispatcher("error.jpg").forward(req, res);
          } else {
                  chain.doFilter(request, response);

         }
		
		
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
